Hi, I also have AVN of the hip due to pregnancy. I had a CD in December and it hasn't worked. Now the OS are finally talking about a THR, though I have had to have a second opinion to get that. My experience of CD hasn't been great and I agree that you should push for a THR as soon as possible as from the reading I've done it seems this is likely to be the only way you will get some relief from the Pain. I too have been offered the injections but haven't had one yet, I am still debating whether to try them or not. Sorry I can't be more positive about the CD. If I knew then what I know now I wouldn't have had it done. Good luck to you, I hope it gets sorted soon. x